Machine for producing transposition charts



March 17, 1953 R. T. BARBEE ET AL MACHINE FOR PRODUCING TRANSPOSITION CHARTSv 2 SHEETS--SHEET l Filed Jan. 3, 1949 M /z j// /l/ j/ s 7 5 u I5v I9 2s 27 3| 35 39 t s 9 ls l? 2| 25 29 s3 a? 4| I2 6| Ilo |14 2 ze so 34 sie 42 4 e l2 |e 2o 24 2e s se 4o llx March 17, 1953 R. T. BARBEE ET AL 2,631,711

MACHINE FOR PRODUCING TRANsPosITIoN CHARTS Filed Jan. s, 1949 2 SHEETS- SHEET 2 SLBNOVEIS uNaALANcED L SHEET No M|\ Es POLES THIS SHEET TOLL LINE LENGTH Patented Mar. 17, 1953 f v` UNITED* STATES PATENT OFFICE MAoHiNE Foa PRODUCING TRANsPosITIoN CHARTS Roy T. Barbee and Mason B. Wiley, Charlotte,

N. C., assignors to Frank W. Orr, trustee, Charlotte, N. C.

Application January 3, 1949,` Serial No, 68,928

' 2 Claims.

The invention relates to la method and means of printing characters, and more especially is directed to a method and means of printing certain symbols or characters more commonly referred to in the communication eld as Vtranslposition designs or transposition charts.

The function of trans-positions is to mitigate noise and lcross talk on to'll and exchange circuits assigned to open Wire facilities. More particularly, an open Wire is an uninsulated wire on a glass or other type insulator which is mounted on a Wooden or steel pinsecured to the cross arm of a supporting pole. A transposition has reference to the transposing or changing of Wires from one pin position to another `and a single transposition is the interchangeof two wires on -adjacent Ipins. A phantom transposition is the interchange of four Wires associated in a group and supported by fou-r pins in consecutive horizontal positions.

The processes currently used for producing these transpositions are not satisfactory, in that they require a considerable amount :of time to prepare and are subject to many and costly errors. Generally, the end has been accomplished by the employment of electrotypes, photocopying and hand drawn charts. It can be seen, therefore, that highly skilled and high salaried personnel are required to produce the transpositions and even so, it is not possible to eliminate errors in the preparation of the transposition charts.

A salient object of the present invention is to provide a method and means of producing transposition charts which obviates the -employment of highly skilled personnel land which Will eliminate the disadvantages now present in the eld.

Another object is to provide a method and means of modifying :a conventional printing machine, such as the typewriter, to include certain symbols whereby any desired configuration in any and Iall groups of Wires may be printed.

Another object of the present invention is to reproduce the `desired symbols on a tape or the like, and the tape may then be employed with a machine for repeatedly and automatically re- Iproducing the symbols.

In the drawings: i

Figure 1 is a diagrammatic representation of ia typewriter keyboard wherein the upper case of the type bars actuated by the keys Iat the left side of the upper row has been modied to employ the symbols necessary to produce the transpositions.

Figure 2 is a diagrammatic view of one of the charts prepared according to the invention.

Figure 3 is a diagrammaticrepresentation of thevtype bars having the distinctive symbols thereon.

Figure 4 is a diagrammatic representation showing the manner in which the single trans- -positions and phantom transpositions are formed.

Figure 5 is a diagrammatic representation i1- lustrating the location of the respective symbols relative to each other.

As shown in Figure 1, in the upper or topmost row of keys the upper case of the type bar on which appears normally the quotation mark 'has been modified to forma horizontal line I0. The upper case of the 'adjacent type :bar i-s formed with a symbol including la horizontal line II which is in alnement with the line I0, Iand the apex of a V I2 rests at approximately the mid point of the line II. The apex of an inverted V I3 also rests at the midpoint of the line II and this symbol is used to designate a single tran-sposition in 4one pair of wires as illustrated in Figure 2.

The next adjacent type bar also has its upper lcase modified to form as V I4. The V I4 is -located on the bar in such a manner that the upper end of each leg Will be connected with the line formed by the horizontal line I0. The next adjacent -bar is also altered in its upper case to form an inverted V I5, the apex of Which is adapted to be connected with the apex. of the V I4, While the free extremity of each leg Will 'be attached to the line produced by the horizontal line I0, thus providing an X-sh-aped symbol employed to denote a phantom transposition.

For ideal operation, it has been ascertained that the line III should be 1A; inch in length and that the 'diagonal line formed by the legs of the V I2 and inverted V I3 should be als inch. The lsymbols I4 and I5 should each be 1/8 inch in height, thus providing a complete character 1/4 inch in height or twice the height of the symbol employed to denote a single transposition.

The symbols or characters above mentioned are important and the location of these characters on the type bar is critical to the proper preparation of the transpositions. More specically, the horizontal or straight line I0 must be located on the type bar so that it will connect with the horizontal line II and that the apices of the members I4 and I5 merge and that the free ends of each leg of these later members connect with the lines formed by the horizontal line I0.

In connection with the V I4 and the inverted V I5, it is possible to make this symbol by plactype bars for'theupper Arow of keysbeing'modied to provide'the desiredl-symbolspit is, ofcourse;

apparent that other bars could be utilized to accomplish the desired end. However, by locat-.- ing the symbols as set forth does notmodifythe ,A alphabet or numeral arrangement toff'corwen' tional machines which, of course, is an`im'por-' tant factor to be consideredc.;

In operation, the symbols :will berreproducedf upon a tape, disk or other element and afterwards the tape may be used Withan electric ma..n

chine to reproduce the symbols repeatedly and automatically. Upon the selection of the desiredprepared tapes and by joining these tapes in the properwsequence; va :complete Y. and r accurate transposition-r design may -beaautomatically re produced, one of such designs being show-nina Figure f- 2.J

Byvthepreparationxof the-,mastertapey it-.is-v p ossiblezforfk theseA4 tapes vto bef filed so .as :to be A readily available to Athe individual preparing Ythe charts. and .enable a vcomplete rchart .tol be. repro.-4v duced in a fraction of the time. necessaryunder..

current procedures..y Moreover, upon 4checking the accuracy ofthe master'tape,.it-canbe seen. that there is eliminated -any possibilityoferrors which has always been-troublesomevin the past Theinventionis not to be connedtolany strict conformity With the Ashowing .inthe draw,

ing-but may be :changedor modified so long. as. such changes'orfmodifications mark no material,

departure from the'salient features ofthe invention as fexpressed in vthe appended claims.

We claim:

1. A@ machinerior producing. symbols tm-be used for the preparation of atransposition chart for use in: the communication ,-eldvcomprising fa keyboard, type -lbars-soperated by the keyboard..

one off Vsadbars having v a horizontal-1 linetheref.

on; 'another Yof -said typebars Ahaving, a Y comple-l mental horizontal line thereon together with a v symbol, the apex of the v being disposed at approximately the mid point of said horizontal line, and an inverted v symbol, the apex of Which is located at the mid point of said horizontal line thereby defining an x-shaped symbol denoting:4 aisingl'e t transposition with the horizontal lines fof "said bars producing fthe' horizontal line on the chart, another of said type bars -being provided with a V symbol extending below .thesaid.horizontal lines on said other bars W-ith'th'e-upper end of each Yleg thereof connectabl'to the horizontal line produced by said otherbars; and another of said type bars having 'an invertedf'l'v symbol thereon with the apex thereof joinable=to`-the apex of the V symbol and thelegsfconneetable to another horizontal line produced by said 'horizontal line bars below the stlnained horizontal line thus defining an X- shaped symbol denoting a phantom transpositionf.:

2- A machines'for .producing symbols tobe'used. forcthe fpreparatiorrzofr a transposition chart for usezinfthe'communication field,i as -deiined 'inand i 1 claimedbyglclaim 1, further.'characterized-in v'thatv the height of: the rX-shaped symbol denotingathef` phantom transposition istwice` that of the; x-

shaped'fsymbol denoting. ,the single#transposition.y

REFERENCESCITED The following' references are .of hrecord in. the. 

